So far I have always used the very conventional Mach3 blades. In the sensitive blades I could see the following differences. The color scheme in the Sensitive blades are the rubber and plastic parts green (which is indeed my favorite color is me here but rather unimportant). The Lubrastrip top is a bit wider, well below the rubber lip. Otherwise also here 3 sharp blades at work.
In shaving experience and results I can personally determine the normal Mach3 blades no difference. As usual with the normal blade, slide the Sensitive during shaving to leave gently and without injuries over my skin and achieve fast and efficient even at difficult points in the genital area the desired result. I could no longer shelf life of the blades notice but come with a blade when using all two days also through about 3 weeks.
So I can confirm though that it is a quality product even at these blades, they will not buy more blades or only in the case because of the additional costs to the regular Mach3, if I do not get normal blades on the fly.